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  • Articles  (120)
  • Canadian Science Publishing  (120)
  • 1980-1984  (120)
  • Canadian Journal of Forest Research. 1980; 10(1): 17-24. Published 1980 Mar 01. doi: 10.1139/x80-004.  (1)
  • Canadian Journal of Forest Research. 1980; 10(1): 25-29. Published 1980 Mar 01. doi: 10.1139/x80-005.  (1)
  • Canadian Journal of Forest Research. 1980; 10(1): 30-34. Published 1980 Mar 01. doi: 10.1139/x80-006.  (1)
  • Canadian Journal of Forest Research. 1980; 10(2): 143-151. Published 1980 Jun 01. doi: 10.1139/x80-026.  (1)
  • Canadian Journal of Forest Research. 1980; 10(2): 237-237. Published 1980 Jun 01. doi: 10.1139/x80-039.  (1)
  • Canadian Journal of Forest Research. 1980; 10(3): 257-263. Published 1980 Sep 01. doi: 10.1139/x80-044.  (1)
  • Canadian Journal of Forest Research. 1980; 10(3): 284-289. Published 1980 Sep 01. doi: 10.1139/x80-048.  (1)
  • Canadian Journal of Forest Research. 1980; 10(3): 371-378. Published 1980 Sep 01. doi: 10.1139/x80-062.  (1)
  • Canadian Journal of Forest Research. 1980; 10(3): 389-394. Published 1980 Sep 01. doi: 10.1139/x80-064.  (1)
  • Canadian Journal of Forest Research. 1980; 10(3): 395-404. Published 1980 Sep 01. doi: 10.1139/x80-065.  (1)
  • Canadian Journal of Forest Research. 1980; 10(4): 464-469. Published 1980 Dec 01. doi: 10.1139/x80-076.  (1)
  • Canadian Journal of Forest Research. 1980; 10(4): 470-475. Published 1980 Dec 01. doi: 10.1139/x80-077.  (1)
  • Canadian Journal of Forest Research. 1980; 10(4): 510-516. Published 1980 Dec 01. doi: 10.1139/x80-083.  (1)
  • Canadian Journal of Forest Research. 1980; 10(4): 555-558. Published 1980 Dec 01. doi: 10.1139/x80-091.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 118-123. Published 1981 Mar 01. doi: 10.1139/x81-016.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 124-131. Published 1981 Mar 01. doi: 10.1139/x81-017.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 13-17. Published 1981 Mar 01. doi: 10.1139/x81-003.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 187-189. Published 1981 Mar 01. doi: 10.1139/x81-025.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 69-72. Published 1981 Mar 01. doi: 10.1139/x81-009.  (1)
  • Canadian Journal of Forest Research. 1981; 11(1): 73-81. Published 1981 Mar 01. doi: 10.1139/x81-010.  (1)
  • 4788
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  • Articles  (120)
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  • Canadian Science Publishing  (120)
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  • 1
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    Sulfur dioxide injury, sulfur content, and stomatal conductance of birch foliage (1981)
    Canadian Science Publishing
    Details
    Publication Date: 1981-03-01
    Description: Seedlings of three birch species were exposed biweekly to 2358 μg/m3 (0.9 ppm) SO2 for 2 h from May to September 1977. Leaf sulfur content of the birch foliage increased following exposure to SO2, but sulfur accumulation was not correlated with visible injury. Relative susceptibility was significantly correlated with preexposure leaf conductance rates of Betulanigra L. and B. papyrifera Marsh., but not for B. pubescens Ehrh. Leaf conductance rates were not correlated with sulfur accumulation.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Canadian Science Publishing
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  • 2
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    Discussion: Response of bark tissues to injury and infection (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-06-01
    Description: Research of nonspecific defense processes in woody plants has focused on xylem. From these studies the concept of compartmentalization sensu Shigo was developed. Responses of bark to injury and infection, however, are understood poorly. This discussion summarizes evidence for the occurrence of processes similar in function to xylem compartmentalization in bark. We suggest that a developmental approach to research on woody plant responses to injury and infection could result in conceptual unity regarding structural and functional changes in both xylem and bark.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 3
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    Generalized biomass estimation equations for Betulapapyrifera Marsh. (1981)
    Canadian Science Publishing
    Details
    Publication Date: 1981-12-01
    Description: Aboveground biomass estimation equations were developed and compared for several components of Betulapapyrifera Marsh, trees using diameter at breast height (dbh) alone or dbh and height as independent variables. The data upon which the equations are based were collected by a number of different investigators working in Minnesota, Wisconsin, New Hampshire, and several sites in Maine and New Brunswick. Coefficients of determination ranged from 0.82 to 0.99, with higher values for bole than for crown components. The root mean-square deviation of the observations from the model was in the range 1 – 10 kg for any component. The largest trees in the data set (ca. 30 cm dbh) had total aboveground biomass of about 540 kg. In the absence of site-specific data, these equations provide acceptable estimates of biomass for B. papyrifera.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 4
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    Effects of early cone collection and artificial ripening on white spruce and red pine germination (1981)
    Canadian Science Publishing
    Details
    Publication Date: 1981-12-01
    Description: Two experiments were conducted at the Petawawa National Forestry Institute, Chalk River, Ontario, in 1978 to test the feasibility of early cone collection and to determine the optimum conditions for the artificial ripening of white spruce and red pine cones. Cones were collected at periodic intervals, commencing 7 weeks before natural cone ripeness, and stored under four storage conditions and three storage periods. White spruce cones collected August 1, 4 weeks before natural seed dispersal, and stored on open, screened trays for 12 weeks at 5 °C and 75–95% relative humidity yielded seeds of high germinability. Seeds extracted from cones immediately after this collection failed to germinate. Cold storage of white spruce cones at 5 °C for as little as 4 weeks eliminated dormancy and the subsequent need for seed stratification after extraction. Good germination of red pine seeds was obtained from cones collected August 16, 7 weeks before natural seed dispersal, and stored on screened trays in a well-ventilated, unheated building, for 4 weeks.Completion of embryo growth must be attained before artificial ripening can be successfully applied; it may be used as an index for commencement of cone collections provided subsequent cone handling includes artificial ripening.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 5
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    Protoplast isolation from Ulmusamericana L. pollen mother cells, tetrads, and microspores (1980)
    Canadian Science Publishing
    Details
    Publication Date: 1980-09-01
    Description: Meiotic protoplasts of Ulmusamericana (American elm) are potentially valuable for producing interspecific elm hybrids through protoplast fusion. Meiotic cells (pollen mother cells, tetrads, and microspores) were incubated in either a cellulase, hemicellulase, and pectinase enzyme solution or a β-1,3-glucanase (laminarinase) solution. Respective protoplast isolation frequencies for the three meiotic cell types were 100, 50, and 10%. Exclusion staining with 0.2% Evans blue and 0.1% methyl blue suggested protoplast viability. Some of the microspore protoplasts were vacuolated, which is an important condition for cell division. Although attempts to regenerate cell walls and induce cell division were unsuccessful, these two problems may be superceded by protoplast fusion with more regenerative protoplasts. To our knowledge this is the first report of protoplast isolation from meiotic cells of a tree species.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 6
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    Effect of SO2 on growth and sulfur content of hybrid poplar (1981)
    Canadian Science Publishing
    Details
    Publication Date: 1981-12-01
    Description: Growth of hybrid poplar clone NE-388 (Populusmaximowizii Henry × trichocarpa Torr. & Gray) was significantly reduced by repeated continuous 72-h exposures to 0.12 or 0.25 ppm SO2 for 6 or 14 weeks, respectively. Both dosages of SO2 induced significant defoliation of the oldest leaves. The sulfur content of abscised foliage ranged from 0.90 to 1.70% S dry weight basis compared with control values of 0.24 to 0.32% S. These sulfur values may provide information on the role of hybrid poplar in removing pollutants from the atmosphere.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 7
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    A new analytical model based on the −3/2 power rule of self-thinning (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-10-01
    Description: A nonlinear analytical model is developed to describe the relationship between average plant size (weight or volume) and stand density in single-aged, monospecific plant populations. The model gives estimates of the slope and intercept of the −3/2 power rule asymptote, the nature of the size–density trajectory, and such features as relative density at crown closure and the effects of soil type or site index. The model is tested by growing red alder (Alnusrubra Bong.) seedlings under greenhouse and lath house conditions at three initial spacings (8 × 8, 4 × 4, and 2 × 2 cm) and two soil types (river loam and alder forest soil) for 525 growth days. There are seven harvests, starting at crown closure. All size–density trajectories tend consistently towards the same single asymptote irrespective of initial spacing, soil type, or age. The asymptote slope and intercept are 1.46 and ca. 94 kg tree−1•m−2. The crown closure line is parallel to the asymptote at a relative density of 4.6 × 10−3. The model also adequately describes the size–density trajectories for 20–50-year-old red pines (Pinusresinosa Ait.) growing at six initial spacings. The asymptote slope and intercept are 1.6 and ca. 87 × 103 m3•tree−1•ha−1, respectively.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 8
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    Differential response of paper birch provenances to aluminum in solution culture (1980)
    Canadian Science Publishing
    Details
    Publication Date: 1980-03-01
    Description: Progenies belonging to 49 open-pollinated families of paper birch (Betulapapyrifera Marsh.) representing 13 provenances were evaluated sequentially for rate of root elongation in solutions containing only calcium nitrate and solutions containing calcium nitrate + 120 ppm aluminum. Provenances, but not families within provenances, differed significantly in both rate of root elongation and apparent response to Al. Provenance mean tolerance indices (root growth in Al solutions/root growth in non-Al solutions) varied from 0.10 to 0.37. Exposure to 120 ppm Al caused decreased concentrations of Ca and Cu in the foliage, decreased or nearly unchanged concentrations of P and Mg, and increased concentrations of Al, B, and Mn. Compared with the more tolerant provenances, intolerant provenances exhibited generally greater increases in foliar Al concentration after exposure to Al. Differential tolerance to Al will be useful in improving the performance of planted trees on Al-toxic sites.
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    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 9
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    Low-site class black spruce and jack pine nutrient removals after full-tree and tree-length logging (1983)
    Canadian Science Publishing
    Details
    Publication Date: 1983-12-01
    Description: An old, merchantable, low-site class black spruce (Piceamariana (Mill.) B.S.P.) stand growing on a Lithic Humo-Ferric Podzol overlying a granite bedrock, and a younger but merchantable low-site class jack pine (Pinusbanksiana Lamb.) stand growing on a Ferro-Humic Podzol overlying a deep coarse sand near Baie Comeau, P.Q., were analysed for stand biomass and macronutrient contents of both stand and soil. The magnitude of the depletions of macronutrients from the site, in full-tree and tree-length methods of logging, are compared with their available and total quantities in the soil. The range of values from the literature for nutrient inputs are presented and discussed in relation to logging losses. The results suggest that full-tree logging in the dry jack pine stand could cause a severe loss of potentially mineralizable N supply; P, K, and Mg deficiency problems owing to export are not apparent, but a Ca balance problem is apparent. The implication is that full-tree logging should be avoided on such sites.
    Print ISSN: 0045-5067
    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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  • 10
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    An evaluation of growth response of young, spaced balsam fir to 3 years of spruce budworm spraying with Bacillusthuringiensis (1984)
    Canadian Science Publishing
    Details
    Publication Date: 1984-06-01
    Description: Growth response of young, spaced balsam fir (Abiesbalsamea (L.) Mill.) to 3 successive years (1979–1981) of treatment with Bacillusthuringiensis Berliner for spruce budworm (Choristoneurafumiferana (Clem.)) control was examined in 20 plots on the Cape Breton Highlands, Nova Scotia. Defoliation commenced in 1976, 3 years before control operations began. Five plots were established both inside and outside the spray block, in areas that had been severely defoliated by budworm and in areas moderately defoliated. All plots in the severely defoliated area suffered heavy tree mortality, but mortality was significantly lower in the protected plots. In contrast, the moderately defoliated plots suffered virtually no tree mortality. The average volume increment of stem-analyzed trees from 1979 to 1981 was 0.63 dm3/tree for protected and 0.43 dm3/tree for unprotected trees in the severely defoliated area versus 4.15 dm3/tree for protected and 3.08 dm3/tree for unprotected trees in the moderately defoliated area. These volume increment values are equivalent to 8.8 m3/ha of growth between 1979 and 1981 for protected plots in the moderately defoliated area, compared with 6.1 m3/ha for unprotected plots. Therefore, a total gain of 2.7 m3/ha can be attributed to the 3 years of B. thuringiensis spraying. Long-term growth responses toB. thuringiensis spraying were not evaluated. Better results would be expected had protection started at the beginning of the budworm outbreak, instead of after 3 years of severe defoliation.
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    Electronic ISSN: 1208-6037
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
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